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API 6A - 21st EditionSpecification for Wellhead and Tree EquipmentPublication Date: November 2018Effective Date: November 2019

For Reference Only

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2nd Edition published

September 2019

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1st Edition Recirculation Ballot closed December

3rd 2019.Awaiting

Publishing

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Addenda 1

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Addenda 1 – Ballot / Comment Review Status

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Addenda 1 – Ballot / Comment Review Status

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Eric Wehner Idea for Categorization of Assemblies

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6A 21st Edition Current Status

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Eric Wehner Idea for QTC Size Requirement Clarification

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Queries & Potential Future Work

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Questions?

API 6A 21st Addendum 2Materials Work Group f/ Items 6, 17, 19, 20

Sterling Lewis - ExxonMobil

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Two meetings held• August 12• October 17

23 Members, 14 meeting participants

Activity

2

Summary of Items to Address

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Item 6a: Batch-type Furnace Heat Treatment (size) Use DAC

Item 6b: Clarification of QTC requirements/applicability (Example of PSL3 HT Lot)

Item 17: Martensitic Steel applicability to HT requirements

Item 19: ER maximum critical wall section versus thickest section (exception allows critical cross section) Use critical wall section(s)

Item 20: Deposited weld metal impact properties in HAZ(must meet specified mechanical properties for part)

New RFI: Equivalent round requirements for bar in batch furnace. Batch heat treat requirements apply

New: Item 8 Composition Limits

New RFI: Equivalent round requirements for bar in batch furnace

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Title DescriptionPublication Type Spec Publication Number 6aEdition 21stAddendum/ErrataNumber 6aSection Referenced 6.4.2.3.2Subject Equivalent round requirements

Background

6.4.2.3.2 breaks down the required Equivalent Round (ER) requirements of the forging QTC for various PSL levels. I have always considered forged bar stock to be a forging, which seems uncontroversial, but the paragraph as copied below raises a question as to how to apply this to section sof pre-heat treated barstock that are cut to make a final part. "For PSL 3, for bodies that require a yield strength of 75ksi or greater and where the parts weight during heat treat is greater than 454kg (1000 lbs), the QTC ER shall be the same or greater than the part it qualifies but is not required to exceed 250mm (10 in.) ...." The weight limit doesn't even make sense to me if you are talking about a continuous furnace... I have talked to a couple metal distributors who can't figure it out either and are planning on responding "no bid" to RFQ's because of it.

Question

For bar stock, what defines the 454 kg / 1000 lb limit of applicability of this section? 1. Is it the weight of the entire length of the bar as processed at the mill? ( it was quite possibly done in a continuous furnace) 2. The weight of cut bar that the final body will be made from? 3. The weight of the finished body?

New RFI: Equivalent round requirements for bar in batch furnace

5

Proposed Response October 17

Requirements for continuous heat treatment process and batch heat treatment furnace are considered clear. If a bar is cut and heat treated in a batch type furnace then the batch heat treatment requirements are applicable. If the bar is heat treated as a single piece in a continues heat treatment processes then the continuous heat treat process requirements are applicable. Bar heat treated in a continuous heat treat process then a portion of the bar reheatreated in a batch heat treated process would require the OTC of the reheatreated bar to be subjected to both heat treatment cycles of the full bar and batch heat treatment cycle.

Any Mandrel Hanger or Body

> 1000 lbs

Yes

PSL 3Mandrel / Body

> 75ksi DAC

Same as PSL 1, 2 (HEAT)

QTC does not have to exceed (5”) ER

Start

PSL 1, 2

PSL 4 Heat & Heat Treat Lot Prolongation

Heat + same furnace and quench tank

ER does not have to exceed (10”) ER

Continuous Furnace

Yes

No

Yes

No (batch)

Yes

Heat QTC does not have to exceed (2.5”) ER

Prolongation, heat and heat-treat lot.

6.4.1 P7

Same cross section as part

Design Documentation

Qualification Forging / Sacrificial Part (process

Verification)

QTC does not have to exceed (5”) ER

Age-hardened nickel-based alloy API 6CRA

No

Yes

Other pressure containing and

Controlling6.2 Written Specifications

No

Yes

Current 21st Edition + Design+ Body 75K & 1000 (October 17)

Exception

Heat + same furnace and quench tank

No

No

No

Uniform CS same as CS, Complex Prolongation does not have to be thickest CS but must equal

or exceed ER for part…6.4.1

6

Yes

Look at moving material section to 614.13.3 has heat treat section for hangers14.2.3 has heat treat section on ring gaskets

Include item 19 – critical section “a qualification forging or a sacrificial part is used to document that the part meets the Charpy impactrequirements of this specification at a depth of 63 mm (2.5 in.) or T/4 of the thickest section of the parts,whichever is less; and”

Mandrel Hanger

Yes

No

Other than body and bonnet

6.3,6.4 Written SpecificationsYes

QTC does not have to exceed (5”) ER